package com.xiaotu.common.util;

import java.lang.reflect.Field;

/**
 * 反射工具
 */
public class ReflectUtil
{
	
	/**
	 * 获取obj对象fieldName的Field
	 * @param obj
	 * @param fieldName
	 * @return
	 */
	public static Field getFieldByFieldName(Object obj, String fieldName)
	{
		for (Class<?> superClass = obj.getClass(); superClass != Object.class; superClass = superClass
				.getSuperclass())
		{
			try
			{
				return superClass.getDeclaredField(fieldName);
			}
			catch (NoSuchFieldException e)
			{
			}
		}
		return null;
	}
	
	/**
	 * 获取obj对象fieldName的属性值
	 * @param obj
	 * @param fieldName
	 * @return
	 * @throws SecurityException
	 * @throws NoSuchFieldException
	 * @throws IllegalArgumentException
	 * @throws IllegalAccessException
	 */
	public static Object getValueByFieldName(Object obj, String fieldName)
			throws SecurityException, NoSuchFieldException,
			IllegalArgumentException, IllegalAccessException
	{
		Field field = getFieldByFieldName(obj, fieldName);
		Object value = null;
		if (field != null)
		{
			if (field.isAccessible())
			{
				value = field.get(obj);
			}
			else
			{
				field.setAccessible(true);
				value = field.get(obj);
				field.setAccessible(false);
			}
		}
		return value;
	}
	
	/**
	 * 设置obj对象fieldName的属性值
	 * @param obj
	 * @param fieldName
	 * @param value
	 * @throws SecurityException
	 * @throws NoSuchFieldException
	 * @throws IllegalArgumentException
	 * @throws IllegalAccessException
	 */
	public static void setValueByFieldName(Object obj, String fieldName,
			Object value) throws SecurityException, NoSuchFieldException,
			IllegalArgumentException, IllegalAccessException
	{
		Field field = obj.getClass().getDeclaredField(fieldName);
		if (field.isAccessible())
		{
			field.set(obj, value);
		}
		else
		{
			field.setAccessible(true);
			field.set(obj, value);
			field.setAccessible(false);
		}
	}
}
